Simple pf ruleset

[jhp]

Hi Everyone

I'm new to FreeBSD and am attempting to set up pf rules which will allow all traffic through a gateway machine, and redirect port 80 requests for transparent squid proxying.

This is my pf.conf, a very simple one, but for some reason it doesn't seem to be redirecting, does anyone have any idea why?

## Definitions
int_if="em0"
ext_if="fxp0"
lan="192.168.0.0/24"

## Redirect WWW traffic to local cache
rdr on $int_if proto tcp from $lan to any port www -> 127.0.0.1 port 3128

## No restrictions on Loopback Interface
pass in quick on lo0 all
pass out quick on lo0 all

## No restrictions on Inside LAN Interface for private network
pass out quick on $int_if all
pass in quick on $int_if all

## No restrictions on WAN Interface
pass out quick on $ext_if all
pass in quick on $ext_if all

I'm using FBSD 6.1-Release.

Thanks

John